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  1. cycloid

    • IPA[ˈsīkloid]

    美式

    • n.
      a curve (resembling a series of arches) traced by a point on a circle being rolled along a straight line.
    • noun: cycloid, plural noun: cycloids

    • 更多解釋
    • IPA[ˈsʌɪklɔɪd]

    英式

    • n.
      a curve (resembling a series of arches) traced by a point on a circle being rolled along a ...

    Oxford Dictionary